linux-kernel - Re: perf: record segfaults for cycles event when collecting data on a VM

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Message-ID: <20120209073024.GA18010@elte.hu>
Date:	Thu, 9 Feb 2012 08:30:24 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	David Ahern <dsahern@...il.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Jason Wang <jasowang@...hat.com>
Subject: Re: perf: record segfaults for cycles event when collecting data on
 a VM


* Joerg Roedel <joerg.roedel@....com> wrote:

> > which makes sense. It forces 
> > perf_session__find_machine_for_cpumode() to return the host 
> > machine always.
> 
> Great, thanks. I will send two patches tomorrow to fix Jason's 
> problem and change the default for perf_guest.

Well, if the crash is fixed then the the default can stay, 
right?

Generally we should treat all input data in a perf.data or even 
the bits we get in the ring-buffer as external data that has to 
be checked carefully, with no assumptions made about data.

Thanks,

	Ingo
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